38 weeks pregnant & taking care of two sick people. How to stay healthy?

My boyfriend came home early from work vomiting and my sister has a sinus infection (still contagious). We're all roommates. This all just happened today. Neither of them were showing symptoms of their illness yesterday.

I'm 38 weeks pregnant and I do NOT want to be sick. I took one packet of Emergen-C tonight and have hand sanitizer to use after each dealing with them. Both are pretty much bed ridden right now.

My mom said as long as I wash my hands/use sanitizer regularly after doing things for them that I should be fine since my immune system is revved up currently.

What are things you'd recommend to keep me in good health? My arms and ribs are already aching but that's probably just from the pregnancy and catering to everyone today. And I'm a bit of a hypochondriac at times...